//对象深拷贝        public static T Copy
     
      (T oldObject) where T : class,new()        {            T newOrder = new T();            MemoryStream stream = new MemoryStream();            BinaryFormatter bf = new BinaryFormatter();            bf.Serialize(stream, oldObject);            stream.Position = 0;            newOrder = (bf.Deserialize(stream) as T);            return newOrder;        }